8,776 research outputs found
Biotic interactions affect the colonization behavior of aquatic detritivorous macroinvertebrates in a heterogeneous environment
No full textIt has previously been suggested that macroinvertebrates actively search for suitable patches to colonize. However, it is not well understood how the spatial arrangement of patches can affect colonization rates. In this study, we determined the importance of the environmental factors (distance, connectivity and resource availability) for patch colonization in an experimental system using Gammarus aequicauda (Amphipoda), Lekanesphaera hookeri (Isopoda) and Ecrobia ventrosa (Gastropoda). Furthermore, we also assessed how the relative importance of each of these environmental factors differed in interactions between the three species. The single species experiments showed that distance was the most important factor for G. aequicauda and E. ventrosa. However, while E. ventrosa preferred patches close to the release point, G. aequicauda strongly preferred patches further from the release point. High resource availability was a strong determinant for the patch colonization of G. aequicauda and L hookeri. Connectivity was only of moderate importance in the study system for L hookeri and E. ventrosa. The effects of the environmental factors were strongly affected by interspecific interactions in the multispecies experiments. For G. aequicauda, the distance preference was lowered in the presence of E. ventrosa. Moreover, while for L hookeri the effect of resource availability was ruled out by the species interactions, resource availability gained importance for E. ventrosa in the presence of any of the other species. Our results suggest a strong link between environmental factors and biotic interactions in the colonization of habitat patches and indicate that the effect of biotic interactions is especially important for species sharing similar traits.</p
ROSENTHAL, Eric Inventory of documents
No full textCOVERAGE 1904; 1 File; 011 metre.Private papers of Eric Rosenthal, author, journalist and broadcaster
tritrophic-dispersal-model: Code used for creating figures for "Non-hierarchical dispersal promotes stability and resilience in a tri-trophic metacommunity"
No full text<p>This is the commented code used for creating figures for the paper. Any questions regarding the code should be directed to the corresponding author and repository owner (Eric Pedersen). </p>
Eric Velazquez Spanish Language Picture Book Award 2022 Acceptance Speech
No full textAuthor Eric Velazquez gives his Silver Medal acceptance speech for Pulpo Guisado (Holiday House)https://educate.bankstreet.edu/spanishlanguageaward/1001/thumbnail.jp
Eric C. Lincoln, Professor of Sociology and Religion, 1971
No full textThis is an interview with Eric C. Lincoln. Eric was a Professor of Sociology and religion, Union Theological Seminary and author of many books and articles on Negro history. In this recording the contributors discuss local memphis politics, sociology, and race relations compared to that of other cities in the South and the rest of the country
Interview with Eric Bentley, author, drama critic, and playwright
No full textDistinguished drama critic and Bertolt Brecht scholar, Eric Bentley is interviewed by WTMJ-TV host Jim Peck and John B. Fuegi, associate professor of Comparative Literature. Bentley recalls his association with Brecht, the critical and creative aspects of literature, and his interest in writing plays for the theater.GrayscaleSoun
Assessing and comparing climatic control on distribution and reproduction of alpine and lowland species in the subalpine habitat of western Norway.
No full textAims and background: Species range shift is among the most well-documented responses to climate change. As a result, a growing number of studies model species climatic niches to predict how species ranges may displace in space and time (SDM studies). These studies are criticised because they do not include reproduction in their predictions. Other studies use empirical data to assess climatic control on reproductive life-stages. However, the climatic niche of reproductive life-stages may not determine the climatic niche of species, limiting the ability of both types of studies to assess the effect of climate change. In this synthesis, I compare the results of a SDM study (Paper I) with the results of two empirical studies focussing on flowering performance (Paper II) and seedling emergence (Paper III). The research focuses on the leading and rear altitudinal edges of lowland and alpine species ranges, respectively, as those are the two delimiting fronts that are expected to be specifically vulnerable to climate change. Reproduction response to climate is a complex process because it involves several sub-stages that can be affected by climate in several ways. Therefore, the results included in this synthesis integrate several direct and size-dependent climatic effects on flowering performance and report on the importance of both the climate conditions occurring at the recruitment sites and those experienced by the source populations for seedling emergence. Study area and species: This thesis makes use of the sub-alpine and alpine landscapes of western Norway to investigate climatic control on species occurrence and reproduction. This study area was chosen because it includes the leading altitudinal edge of lowland species’ ranges and the rear altitudinal edge of alpine species’ ranges. The research uses Viola biflora (alpine), Viola palustris (lowland), Veronica alpina (alpine), and Veronica officinalis (lowland) as study cases because these species are common in the study area and the study sites, and are representative of the alpine and lowland communities occurring at the studied sites. Results and discussion: The climatic control on flowering performances and seedling emergence did not reflect the climatic niches of three out of four species, suggesting ontogenetic niche shift. These mismatches challenge the predictive ability of both SDMs and empirical studies focusing on reproductive life-stages. Papers II and III highlight the complexity of climatic control on reproduction and show species-specific results. Flowering was both climate- and size-dependent for three species, but the way size-dependency was expressed differed between species. Seedling emergence was less species-specific although one species (Veronica officinalis) was found to be affected by the climate experienced by its source populations while the three other species were only responding to the climate of their sowing sites. This illustrates the importance of accounting for the complexity of reproduction to improve climate-change predictions on plant reproduction. Finally, Papers I and II suggest a high importance of biotic interactions from the lowland flora for the two alpine species, stressing the importance of understanding plant-plant interactions to forecast climate-change impacts. Further research and conclusions: Structured population models can resolve some of the problems reported in this synthesis but further methodological developments are necessary to integrate local adaptation patterns and to accurately project the outputs of such models in space. Dispersal has been largely ignored in climate-change studies. Further research should also aim to improve knowledge on dispersal because quantifying dispersal and recruitment rates is required to predict accurately climate-change impacts on plant populations and potential range displacements. Individualistic responses to climate suggest drastic changes in plant communities over the coming years. Given the high importance of biotic interactions, increasing knowledge on species interactions will be an important step to better understand and predict the potential climate-change impacts. Since the climatic control of a given species may not relate to the climatic control of another species, more effort should be given to key and/or endangered species that may have specific value for conservation
Dr. Eric Yellin – Faculty Author Interview
No full textDr. Eric Yellin, Associate Professor of History and American Studies discusses his new book, Racism in the Nation’s Service: Government Workers and the Color Line in Woodrow Wilson’s America, published recently by the University of North Carolina Press. In this book, Dr. Yellin argues that President Wilson’s administration successfully segregated the federal government in the age of progressive politics. He investigates how the enactment of the segregation policy imposed a color line on American opportunity and implicated Washington in the economic limitation of African Americans for decades to com
Essentials of Dental Radiography and Radiology / Eric Whaites and Nicholas Drage.
No full textPrevious edition: Essentials of dental radiography and radiology / Eric Whaites. Fourth edition. Edinburgh ; New York : Churchill Livingstone, 2007.Includes bibliographical references (pages 461-464) and index.x, 478, [2] pages
10th C. Eric Lincoln Lecture Series, 1992
No full textPart of the 10th anniversary of the C. Eric Lincoln lecture series Dr. Love Henry Whelchel moderates a panel of scholars. The panel includes Dr. C. Eric Lincoln, Dr. Jacquelyn Grant, and Dr. John Hope Franklin. The panel discusses the life of George Washington Williams (author of History of the Negro Race in America). The discussion includes issues related to Womanist theology, Islamic religion, sociology, religion and history.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the National Endowment for Humanities - Humanities Collections and Reference Resources Implementation Project Grant in supporting the processing and digitization of a number of its major archival collections as part of the project: Spreading the Word: Expanding Access to African American Religious Archival Collections at the Atlanta University Center Robert W. Woodruff Library
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